Introducing cryptocurrency through altcoin is possible. But the problem is the amount of altcoin is very much so that it is somewhat confusing for ordinary people. On the other hand altcoin tends to be a scam. I think it's better to introduce it via bitcoin itself. Everyone must have heard even though they might not have looked deeper. The real use case I think is only a matter of payment methods. And bitcoin can go into any domain, health, animal husbandry, e-commerce, etc. as long as they really want to use the blockchain.
correct, amount of altcoin is quite a lot, But we can introduce altcoin which has a good reputation to the community, Like ETH, XRP, WAVES and coins that have a high ranking in coinmarketcap. we can introduce some altcoins that have a close relationship in this life such as altcoins which have fast shipping transactions, altcoin which is engaged in gaming, of course the public will more easily understand about the performance of Altcoin.